Rock-drill.



G. J. BEAUDIN.

ROCK DRILL.

APYLIGATION FILED NOV. 24, 1913.

Patented Aug 2' SHEETS-SHEET 1.

7/ INVENTOR ATTORNEY M GJE 66(11 WITNESSES G. J. BEAUDIN.

ROCK DRILL.

PPLIOATIQN FILED NOV 24 1913.

Patented Aug. 11, 1914.

HE S

BET Z,

6' f 1 6 INVENTOR MWQU UNITED STATES PATENT OFFICE.

GEORGE J. anaemia, or star RIVER, mis'sonar.

ROCKS-DRILL.

To all whom it may} cmwern Be it known that-I, GEORGE J. BEAUDIN, 'a citizen of the United States, residing at; Flat River, in the county of St. Francois and State of Missouri, have invented a new and useful Rock-Drill, of which the following is a specification.

This invention has reference to iinprovements in rock drills, and its object is to pro-l vide a drill operable by air pressure which: will be both light in weight and of long life; and economize air.

In accordance with the present inventionj there is provided a cylinder in which is located a reciprocatory piston responsive to1 air pressure and carrying a rod to which a drill or other tool may be attached. Between the piston and the inner wall of the cylinder there is provided a liner valve in the form of a hollow cylinder and responsive to air pressure to move to different operative positions, thereciprocations of the piston controlling the admission of air to the valve to cause a limited reciprocationthereof to cover and uncover ports in turn admitting air to the piston, while mechanism} under the control of the piston is provided; for imparting a slow rotative movement to: the piston andtool rod by the reciprocationsj of the piston.

The invention will be bestunderstood; from a consideration of the following detailed description taken in connection with the accompanying drawings forming a part of this specification, withthe further understanding that while thedra'wingsshow a practical form of the invention, the latter is not confined to any strict conformity with the showing of the drawings but may be changed and modified so long as such changes and modifications mark no material departure within the scope of the cla1ms from the salient features of the invention.

In the drawings:Figure 1 is a longitudinal diametric section of the structure With'the piston at one limit of its stroke, showing some parts in elevation. Fig. 2 is a section similar to Fig. 1 but atright an gles thereto showing the pistonin elevation. Fig. 3 is a section on the line 3-3 of Fig. 2.

Fig. 4 is a section on the line t-d of Fig. 2.

Fig. 5 is a section on the line 5-5of Fig. 2. Fig. 6 is a section on the line 66'of Fig. 1. Fig. 7 is a perspectiveview of a guide collar or nut employed in the structure.

-. Referringto the drawings, there is shown Specification of Letters .P'atent. Application filedtNovember 24, 1913. Serial No. 502,779.

Patented Aug. 11, 11914;.

acasing 1 in the general form of a cylinder having throughout the greater portion of 1ts length a longitudinal cylindrical bore 2,

expanding to a greater diameter near one end, as indicated at 3, and again expanding at the same end, as indicated at 4:, thereby formingrespective shoulders 5 and 6.

At oneend of the cylinder there are provided blocks 7 constituting. guide or bearing blocks, as will hereinafter appear,-and at the other end of the cylinder and in part 1 entering the bore 4 is a head 8. The blocks 7 taper toward one end andmatch to fit together and are engaged by a tapered socket portion9 of a clamp member 10 having ears 11 matching like ears 12 on the head 8. These ears are traversed by bolts 13 exterior to the body member or cylinder 1 and serve to hold certain parts within the cylinder 1. Entering the bore 3 is acollar 14 formed at one end with an outstanding peripheral flange 15 resting on the shoulder 6, and this flange has at an appropriate point a notchor recess 16into which extends a pin 17 carried by the cylinder 1, so that the collar will not turn on its seat. This collar has a port 18 extending through its side wall for a purpose which will hereinafter appear. Thehead 8 is shaped to enter the bore 4 for an appropriate distance, and lodged between. the entering portion of the head 8 and the collar 14: is "a ring 19 having its inner wall formed with a circular series of ratchet teeth 20.

1 Within the ring 19 there is a rotatable block 21 carrying dogs 22 urged into engagement. with the teeth 20 by springs 23. The block 21 is formed at one end with an axial stud 24 and at the other end with an axial stem 25. The stud 24 is lodged in an appropriate seat in the head 8 while the stem 25 extends through a central passage in the collar 14, which collar is provided at one end with 'a head 26 between which and the head 8 theblock 21 is situated. The

stem 25 is formed with long pitch grooves peripheral flange 29 which may fit snugly in the bore 8 theeollar 14 is of such length and so related to the shoulders as to leave an appropriate space therebetween in which the flange 29 may move, and the length of this space limits the extent of longitudinal movement of the liner valve 28.

One end of the space in which the flange 29 travels is entered by a port 30 cOInmuni:

eating with a passage 31 longitudinal of the cylinder 1 and extending to near the other end thereof where it opens toward the in terior of the cylinder by way of a port 32.

The other end of the space in which the flange 29 moves communicates by way of a passage 33 with a port 34 near the same end of the cylinder 1 and opening toward the interior of the cylinder.

' The liner valve 28 is provided with a port 35 through it in constant communication withthe port 32 and long enough to maintain such communication at either limit of movement of the liner valve, so that the passages '39 and 40, respectively, communicating through the walls of the cylinder 1 'with the atmosphere. Still another port 41 is provided in the liner valve 28 near the middle thereof, and this port communicates through a port 42 with the atmosphere,

.while the .port .41 is long enough to maintain communication with the port 42 at all positions of reciprocation of'the liner valve. It is, of course, evident that the ports 39, 40 and 42 could be so connected together and have'one outlet which might be through an exhaust pipe, but such-an arrangement is not necessary, althou'gh perhaps desirable under some circumstances.

At one side of the cylinder 1 there is formed a nipple 43 for the attachment of a pipe coming from a suitable source of fiuid'under pressure, of which compressed air maybe taken as typical. The nipple 43 enters into an elongated passage 44 extending in opposite directionsfrom the nipple toopposite ends of the bore 2 of the cylinder 1, where at one end 'it opens by way of -a port 45 into the port 18 through the collar 14, while at the other end the passage 44 communicates by 'way of a port 46 directly into the interior of the 'bo're2. Both ports 18- and 46 are in the pathof the corresponding ends of the liner valve, so that when the liner valve is at the limit of its 'movement determined by the collar 14 the port 18 is closedthereby' and'when the liner valve is at the other limit'of its movement the port 46 is closed thereby, wherefore the ports 18 and 46 aretopened or closed in .alternation. g a

There is also extending into a slot 61 in Adapted to the interior of the liner valve 28 is an elongated piston 47 having heads 48, 49 at opposite ends with an intermediate head or enlargement 50 having longitudinal grooves or passages 51 therethrough in the direction of the length of the piston. Between the heads 48, 49. and 50 the piston is of reduced diameter forming chambers 52 and 53, respectively, between the cylinder and the inner wall of the liner valve, and these chambers are at all times in communication by way ofthe passages 51.

At one end the piston carries a rod 54 extending through the guide blocks 7, which together form a head for the corresponding end of the cylinder 1, and this head may be made appropriately air tight where 'connected with the cylinder 1 and at the point:

where the rod 54passes through it. It will be understood that the rod 54 atits outer end is arranged for the attachment of any suitable tool, as is customary in rock drills, wherefore no showing of such means of attachment has been made in the drawings.

The end of the piston 47 remote from that provided with the rod 54 is countersunk and lodged in the countersink is a sleeve or nut 55 shown separately in Fig. 7. This nuthas its interior formed withappropriate tongues 56 adapted to the grooves '27 and as the sleeve is in fixed relationto the piston 47, reciprocatory movements of the latter with the nut 55 in engagement with the stem 25 causes oscillatory rotative movements of the stem 25 and with it the head 21, so that at each reciprocation of the piston caused in a manner which will hereinafter appear, the head 21 is locked in the appropriate direction, causing a correspondin rotative movement of the piston in one p ass of reciprocation, and a like rotati've movement of the head 21 with the dogs 22' during the other phase of reciprocation of the piston. Extending axially. through the piston for an appropriate distance is a bore 57 to accommodate the stem 25, theparts being all proportioned to the length of stroke of the piston. The heads 48 and 49 carry packing rings .58, so that the piston 1may be in air tight relation to the inner'wall of the liner valve'and still notunduly wear the latter. The head 8 where entering the bore. 4 is provided with a packing ring 59 rendering this end of the. cylinder air airpressure employed.

' In order to maintain the liner valve 28 in its proper relation tof the various ports in the cylinder 1, a guide pin 60 is provided tight under the on the cylinder lrentering the bore 2 and an appropriate part of the linervalve." j

Assuming that the rock drill structure is in an upright position, such as shown in Fig.

1 and that the interior of the drill is free 7 from air under pressure, then the 'piston 47 will. gravitate to the lower end of the liner valve and the latter will also gravitate, so

that the flange 29 is in engagement with the shoulder 5. If, now, air under pressure is supplied to the nipple 43, it will find its way through the channel or duct 44 to the port 18 then uncovered, the port 46 being covered by the corresponding portion of the liner valve 28. The port 36 is at all times in communication with the port 34, while the port 37 is out of communication with the port 39, wherefore air under pressure finds its way through the duct or passage 33 to the under side of the flange 29 and the liner trapped air above the head 48 of the piston finding ready escape through the port 37 then in coincidence with the exhaust port 39. During this upward movement of the piston the nut 55 tends to impart a partial rotative movement to the stem 25,'but the. latter is then held against movement by the dogs 22 engaging the teeth 20, wherefore the longitudinal movement of the piston causes the latter to rotate for a limited distance by the reaction ofthe stem 25 upon the nut 55. By about the time the head 48 of the piston reaches and blanksthe port 37 the head 49 has passed by the port 35 uncovering the latter to the space then below the piston and in communication with the port 46, receiving compressed air so that now air under pressure flows through the pcrt 35 by way of the port 32 by way of the passage or duct 31, and thence by way of the port 30 to the upper face of the flange 29, whereupon the liner valve is depressed covering or closing the ports 46 and 37 and opening the port 38 to the exhaust port 40. Any movement of the piston 47 beyond the port 87 even while the liner valve is in its upper position causes an entrapping of the,

air above the port 37, so that an air cushion is formed preventing the piston from rising to such an extent as to strike the head 26 of the collar 14. As soon, however, as the liner valve 28 has been moved to its lowermost position the port 18 is opened, thus admitting air above the piston and the latter at once begins its downward journey with great speed, the air below it readily escaping through the then alined ports 38 and 40 which are located so near the bottom of the bore 2 that no material air pocket is formed.

This movement of the piston is the active movement for driving the tool against the rock or other material to he acted upon. Since the port is of sullicient length to always maintain the port 32 in communication with the interior of the liner valve, the passage 31 and the space above the flange 29 quickly exhausts through the liner valve into the chambers 52, 53, and from thence through the ports 41 and 42 to the atmosphere.

Gne side of the cylinder may be formed with a nut 62 for the reception of a suitable screw, it being understood that the structure of the present invention is provided with a mounting such as is customarily employed in connection with rock drills.

That is claimed is 1. In a pneumatic drill, the combination of a main cylinder, a reciprocatory liner valve mounted therein and slidable longitudinally thereof, and a tool operating piston mounted in the liner valve, the cylin der being provided with air passages and ports, and the liner valve with corresponding ports arranged to cause air under pres sure to directly actuate the liner valve in both directions and to be fed to the piston to drive the latter.

2. In a pneumatic drill, the combination with a cylinder having a longitudinal bore with a part of greater diameter, a reciprocatory liner valve mounted in the bore of the cylinder and provided with an outstanding flange adapted to the. portion of the cylinder bore of greater diameter, and a piston mounted in the liner valve and movable lengthwise thereof, the cylinder being provided with air passages and ports and the liner valve with coacting ports to feed air to opposite sides of the outstanding flange of the liner valve to cause reciprocation of the latter, and to the piston to also cause reciprocation thereof.

3. In a rock drill, the combination of a cylinder having a longitudinal bore with a portion thereof enlarged, a liner valve of cylindrical form open at both ends and provided with an exterior flange adapted to the portion of the cylinder bore of larger diameter, and a piston mounted in the liner valve for reciprocation therein, the cylinder being provided with air passages and ports and the llner valve being provided bore of greater diameter, an open-ended cylindrical liner valve having an exterior fiange'movable. in the-bore of the cylinder of greater diameter withthe main portion ofthe liner valve adapted to the main portion of the bore of thecylinder, said liner valve being provided with ports near opposite ends and intermediately, and a tool opvcrating piston mounted in the liner valve,

the air passages and ports of the cylinder and liner valve being related to feed com- "related to the liner valve to cause reciprocation thereof in both directions by air under the initial pressure, and a tool operating piston mounted in the liner valve.

' 6. In a rock drill, the combination with a cylinder having a longitudinal bore and air passages and ports, an open ended liner valve with a bore of even diameter throughout and mounted in the bore of the cylinder for reciprocation therein, said valve being provided with exterior means responsive to 7 air pressure for causing the reciprocation of the valve and said valve being also'provided with ports coacting with the ports of the cylinder, a tool carrying piston mounted for reciprocation within the liner valve and provided with circumferential passages movable into coactive relation with ports of V the liner I valve, and means for imparting rotative movements to the piston and tool 40 V carriedthereby during reciprocatory'movev valve open at both ends, and mounted in the bore of thecylinder and provided with projecting parts extending into the portion of the bore of larger diameter, a collar en'- tering the portion of the bore of larger diameter and determining the extent of movement of the liner valve inone direction, a head member for the cylinder entering, the latter adjacent to thecollar and adapted to hold the collar in place, and a piston mounted in the liner valve for reciprocation therein. 7 j

8. In a rock drill, the combination with a cylinder having a longitudinalbore with means for closing the ends thereoflsaid'cylinderbeing provided with air passages and ports, of an open-ended tubular liner valve therein, and a tool operating piston mounted for reciprocation in the liner valve, certain of the air passages in 'the'cylinder be ing related to the liner valve andthe latter i being constructed to cause its reciprocation in both directions by main air pressure.

In testimony, that I claim. the foregoing as my own, I have heretoaffixed my signa ture in the presence of two witnesses.

Witnesses ARTHUR- PARKER, W. S. WATTS.

Copies of this patentmay be obtained for five cents each, by addressing the c ommissioner ofiatents,

' .Washington, D. 0.?

GEORGE J. B AUDINQ 7 

